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Fix Microsoft 365 Cannot Open Excel Files or Save Word Documents
Question details
The user is unable to open newly created .xlsx files in Excel and experiences file-type errors when attempting to save documents in Word after years of using the software.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Creating new spreadsheets in Excel and saving word processing documents in Word.
- Observed behavior
- Microsoft 365 fails to open new Excel files and blocks the saving of Word documents by throwing file-type errors.
Restart your computer to ensure no background processes are interfering with Microsoft 365, and take a screenshot of any specific error messages you receive to aid in troubleshooting.
Repair Microsoft 365 via Windows Settings
Use the built-in Windows repair tool to fix missing or corrupted application files without completely uninstalling Microsoft 365.
Windows includes a built-in modification tool that can quickly repair broken registry keys, file associations, and corrupted application files that prevent Office apps from functioning properly.
Click the Start menu and select the gear icon to open Settings, then navigate to 'Apps' and select 'Apps & Features' (or 'Installed Apps').
Scroll through the list of installed applications to find 'Microsoft 365', click on it (or the three dots next to it), and select 'Modify'.
Choose 'Quick Repair' for a fast offline fix, or 'Online Repair' for a comprehensive fix. Click 'Repair' and follow the on-screen prompts.
Uninstall and Reinstall using Support and Recovery Assistant
Completely remove Microsoft 365 using Microsoft's dedicated uninstallation tool to clear deep-seated configuration issues, then reinstall a fresh copy.
Open Documents Directly from within the App
Bypass Windows Explorer shortcuts by launching the application first and opening the file internally to check if the issue is tied to file associations.
Try WPS Office to Easily Open Excel and Word Files
If Microsoft 365 continues to experience errors opening or saving files, WPS Office provides a lightweight, highly compatible, and free alternative. It seamlessly supports all standard Microsoft Office formats, allowing you to instantly open .xlsx and .docx files without troubleshooting.
- 1. Download WPS Office: Visit the official WPS website, download the free installer, and run it on your computer.
- 2. Set as Default Application: During installation or upon first launch, allow WPS Office to be set as the default application for .xlsx and .docx files.
- 3. Open Your Files: Double-click your existing Excel spreadsheets or Word documents to open and edit them seamlessly.
Frequently Asked Questions
Why did Microsoft 365 suddenly stop opening my Excel files?
This issue is often caused by corrupted background updates, conflicting third-party add-ins, or corrupted Windows registry keys that break the .xlsx file association.
Will repairing Microsoft 365 delete my saved documents?
No, running the built-in Windows repair tool only fixes the software application files and settings. Your personal documents, spreadsheets, and files remain completely untouched and safe.
What should I do if the Microsoft Support and Recovery Assistant doesn't work?
If the automated assistant fails, you can manually uninstall Microsoft 365 from the Control Panel, restart your computer, and then download the offline installer directly from your Microsoft account portal.
